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Mathematical NotesMorgado, José; Mauldon, J. G.; Walkup, D. W.; Rao, S. K. Lakshmana; Jacobson, R. A.; Marcus, Solomon; Eberlein, P. J.; Bohn, Elwood; Lee, Jong; Mrowka, S. G.; Fell, Harriet; Mather, John; Kirk, W. A.; Cullen, C. G. · The American Mathematical Monthly · 1965